Axial flow fan is currently the most commonly used ventilation and air supply equipment on the market. It is called "axial flow" because the gas flows parallel to the fan shaft, which is the airflow in the same direction as the axis of the fan blades. For example, electric fans and air conditioning outdoor fans operate in axial flow mode. Axial flow fans are usually used in situations where flow requirements are high but pressure requirements are low. Axial flow fan is fixed in position and moves the air. It can be used for ventilation and heat dissipation in places such as metallurgy, chemical industry, light industry, food, medicine, and civil buildings If the casing is removed, it can also be used as a free fan or installed in series at intervals in longer exhaust ducts to increase the air pressure in the ducts. Specifically, it can be used in hardware processing workshops, machinery workshops, textile workshops, clothing workshops, printing and dyeing, shoemaking, plastic, injection molding, die-casting, heat treatment, casting, glass products, spraying, electroplating, electronics, chemical, metallurgical, leather, toy, home appliance manufacturing and other places. Axial flow fans have a simple structure, are stable and reliable; Moreover, the fan has low noise and relatively low noise pollution to people; Axial flow fans are easy to install. Generally, the volume of axial flow fans is not very large, and installation materials are not required in large quantities. The installation difficulty and strength are relatively low, and they can be installed by general electricians and construction workers. Axial flow fans have obvious ventilation and air exchange effects, are safe, and can be connected to air ducts to deliver air to designated areas.